High Operation
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
In the High position, the windshield wiper/washer switch supplies voltage to both the Wiper 1 and Wiper 2 relay coils. This energizes both relays and allows battery voltage from the Wiper 1 relay switched output to the switched input of the Wiper 2 relay through its contacts and out the switched output of the relay to the high speed circuit of the windshield wiper motor. The windshield wiper motor will operate at high speed.